Catholics pretending to be Protestants in Ireland?

[Sinann]

Mary Frances on the Census has a sister Eileen born 1898
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1898/02063/1788402.pdf
When their mother died in 1940 Eileen is the informant
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1940/04731/4265381.pdf
When Eileen dies in 1941
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1941/04711/4258353.pdf
Administration is granted to Mary McIntyre spinster
http://nai.adlibhosting.com/files/Courts/High%20Court/Probate%20Office/Will%20Calendars/Calendar%20of%20grants%20of%20probate%20of%20wills%20and%20letters%20of%20administration%201941.pdf
Not sure if that last link will work correctly so page 518

Is Mary McIntyre spinster Mary Frances of the Census.

Mary F McIntyre single of 64 Lr Drumcondra Rd. died 20 Sept 1979
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_069.jpg
and is in the same plot as Gertie
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_133.jpg
Owner of grave Miss Grace McIntyre sister, who is also in the same plot
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_200.jpg

Irish Independent Sept 21 1979
McIntyre (Dublin) Sept 20 1979 at the Maher Hospital Mary Frances (Maiche) eldest daughter of the late Patrick and Catherine McIntyre 64 Lr Drumcondra Rd. deeply regretted etc.

Mary Frances McIntyre of the 1911 Census never married.

[Dannyboy20]

Mary Frances on the Census has a sister Eileen born 1898
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1898/02063/1788402.pdf
When their mother died in 1940 Eileen is the informant
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1940/04731/4265381.pdf
When Eileen dies in 1941
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1941/04711/4258353.pdf
Administration is granted to Mary McIntyre spinster
http://nai.adlibhosting.com/files/Courts/High%20Court/Probate%20Office/Will%20Calendars/Calendar%20of%20grants%20of%20probate%20of%20wills%20and%20letters%20of%20administration%201941.pdf
Not sure if that last link will work correctly so page 518

Is Mary McIntyre spinster Mary Frances of the Census.

Mary F McIntyre single of 64 Lr Drumcondra Rd. died 20 Sept 1979
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_069.jpg
and is in the same plot as Gertie
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_133.jpg
Owner of grave Miss Grace McIntyre sister, who is also in the same plot
https://buried.fingal.ie/wp-assets-bif/uploads/register-scans/St_Fintans_1973_1_200.jpg

Irish Independent Sept 21 1979
McIntyre (Dublin) Sept 20 1979 at the Maher Hospital Mary Frances (Maiche) eldest daughter of the late Patrick and Catherine McIntyre 64 Lr Drumcondra Rd. deeply regretted etc.

Mary Frances McIntyre of the 1911 Census never married.

Well then I'm absolutely stumped...none of it is adding up....

[Dannyboy20]

Obviously that isn't my great grandmother then, she was another Mary McIntyre it would seem...my great grandfather is no longer a mystery, so thankyou for all the information as he was for a good while! Like I said I think the best thing is to order a birth cert for my grandmother.

[Sinann]

No, John Joseph is still a mystery, it's only a possible birth for him, it needs to be confirmed.

I think you should order your grandmother birth and marriage certs to see if either have a mention of John Joseph's army service.
Also ask the family if anyone has any idea when Mary (McIntyre) Long died, or where she and John Joseph are buried. We need to get an idea of her age. I'm still looking for a death notice for her but it's not looking good.
It may prove the case you'll have to wait until the 1926 Census comes online in 2027 to see what they say about their ages and birth places.

[Dannyboy20]

Could it be she was from somewhere other than Ireland? I know McIntyre is a Scottish surname, could she have been Scottish?

[shanreagh]

Could it be she was from somewhere other than Ireland? I know McIntyre is a Scottish surname, could she have been Scottish?

There are McIntyres in Ireland.
Rather than pondering this I would do as Sinann suggests and get the birth and death certificates of your grandmother ......they are the essential building blocks that will enable you to do further research.  If you have not got your parents certificates then get these as well.   

I would get the printout, ie copies of the original documents. 

[ladybird]

My maternal G/grandmothers were baptised Catholic in Co. Kerry 1850s. Brought up and married Protestant

[Dannyboy20]

Could it be she was from somewhere other than Ireland? I know McIntyre is a Scottish surname, could she have been Scottish?

There are McIntyres in Ireland.
Rather than pondering this I would do as Sinann suggests and get the birth and death certificates of your grandmother ......they are the essential building blocks that will enable you to do further research.  If you have not got your parents certificates then get these as well.   

I would get the printout, ie copies of the original documents.

Yes that's gonna be my next step. Then I can stop all the pondering! Thanks for all the help everyone has given me, much appreciated.