Joint Birthday Party Ideas for Husband and Son?

So my son is turning 1 this year on July 17th and my husband is turning 22 this year on July 30th. Since their birthdays are so close, I was thinking about having both a joint birthday and this would be my first time doing something like this. So if anyone can help me out and give me some ideas, themes, gifts, or anything at all, that would help me out a lot.