Hello Emilee, Firstly welcome to WIKITREE, and do not feel alone here, as someone will reply back, by adding what information you already have on hand, going backwards from your Grandparents Birth CERT and Marriage CERTs or even your Parent CERTS.
I had seen and known of my Grandfather and later his Divorce, also found found out he had 2 Older Brothers that went to WW1, 1 was lucky in coming home, also a younger Sister, with 2 of these I have a small TREE of there Families.
Good Luck
Graeme