Is it possible to find maternal grandfather without mother's help?

First things first.......... your mothers birth cert which she will have will tell you her parents names......... if the father is not on it then the ONLY person who can tell you who he is , is your grandmother herself........

You will not find 1950-55 records anywhere, on or off line........

In the position you find yourself in many people claim they 'need' to know 'medical history' fact is it makes no difference, this 'medical history' claim has been thrown out of court many times in many countries when people have taken it to the maximum legal route, simply as medically it is proved it doesn't give you further information than you have already, your child/ren have DNA from you and your partner, your DNA comes from your parents, their DNA from their parents so your child/ren only have a very tiny percentage of possibly DNA from that one ancestor.......

I do understand your need to know and your anger...but be logical, check the birth cert, if not see if she was baptised, you are likely to be able to get that record...but DO NOT add a name online as this person is alive and has privacy rights.......

I would advise check and see first if you can get to see the birth cert, ask about churches near to where they lived, check the PRs see if the names are in them.... if you can't find anything then don't let this rule your life, you worry about the things you can do something about...let go the things you can't ( or you get frown lines and wrinkles)

Those aunts/uncles might be her siblings. In olden days, women would have babies from the onset of menstruation until menopause; a brother or sister could well be old enough to be a younger child's parents (as in the case in my family).

You never need the assistance of any family member, but oft times it facilitates things if they are willing to cooperate.

The problem in doing the searches is that the 50s are not long enough ago to be listed on reputable sites.

However, you should be able to obtain birth/marriage/death certificates of aunts/uncles/cousins/ancestors...including parents...from the States Health & Human Resources part of the Government at the State Capitol.

If you are willing to trust one of us top 10, send an e-mail with your mother's birth name, date and place; we might be able to find something on ancestry.com. Or, if your library subscribes, you could try yourself. They have some relatively recent birth certificates, but not many.