HI all
So I need a bit of help and I am hoping one of you rootschat sleuths can lend me a hand

As I keep going around in circles

I have a marriage for Sarah Ann Allen in April 1886 in Leicester.
Sarah Ann Allen age 16 (so born about 1870) married Samuel Henry Jarvis 18 (so born about 1868)
Samuel's father was listed as John Jarvis (shoe finisher)
Sarah's father was listed as
Frederick Allen (riveter)
Samuel's parents indeed were a John Jarvis & Elizabeth Ann Wortley who married and lived in Leicester, Leicestershire.
However, I am having a hard time confirming Sarah's parentage....

Problem is that I cannot find Sarah with any connection to a
Frederick Allen...
Or even confirm her place in a family prior to her marriage to Samuel.
Presumably her father "Frederick" was alive in 1886 as her marriage did not indicate 'deceased' for him.
Sarah and Samuel did name their first son, born in 1887, Frederick ...but Samuel had a brother named that too

.
Sarah and Samuel appear married on the 1891 census in St Margaret, Leicestershire (same Parish they married)
On the 1901 in St Lawrence, Northamptonshire
On the 1911 back in Leicestershire
They immigrate to Canada in 1913.
On the 1871 I find a Sarah Ann Allen correct age range living with an Isaac Green (grandparent) but this Sarah's parents seem to be a
JOHN Allen and Sarah Green? And as hard as I try I cannot bridge the Sarah Ann Allen who marries Samuel Jarvis to this couple.
John Allen dies in 1887 .... Wondering if anyone can find a connection either to this John Allen being one and the same aka Frederick Allen. OR actually find the elusive Frederick Allen that would be the father of Sarah Ann Allen-Jarvis?

Thanks for the hand