Inheritance

I have two brothers who are both married and I’m in a committed relationship with a man who has two kids but we’re not married. For Christmas, my dad gave me, my brothers and their wives envelopes with $1000 each from an inheritance, so $5000 total. I feel like I was penalized for not being married. I think each sibling should have gotten an equal amount for our families. AITA for thinking I deserve an equal share?