Odd find in 1939 register

[Top-of-the-hill]

   I decided last night to check my grandfather's cousins in 1939, and found a rather surprising entry.
 I already had a suspicion that one of his female cousins might have been in a mental hospital in 1911, (I could not find her, but there were pointers) then she had another child in 1915, so I thought all was well. However, I found her in 1939 in the city mental hospital, listed with 3 others of the same name, 2 of her daughters, aged 32 and 33, and a spinster of 62, probably the husband's cousin.
    Has any one come across anything similar? Are records likely to be available, or would they still be closed? (If they exist)

   I meant to post this in the Common room, but I suppose it is OK here!

[Rosinish]

I think most records (if available) would be accessible within the 100 yr privacy rule i.e. anyone born prior to 1917 as we are in 2018 which may mean anyone born 1918 may still be alive!

Annie