Inheritance From Grandparents

Location: Washington

Grandpa passed away 8 years ago. My dad (their son) passed away.

My grandma passed away a few months ago.

I got a call that my dad’s portion of the inheritance is coming to me. I was confused because I have two siblings. One is a half sibling, different dad so I know why they aren’t on it. But my other brother, I was told my dad isn’t on his birth certificate, I had no idea (no one knows why, it was their assumption that my mom didn’t know who the dad was… but based on family history I think they split and she left him off on purpose. They never fixed it and she has a history of doing spiteful things) I can’t trust my mom with an honest explanation. But they got back together and had two more kids (a sister also deceased, and me)

I do believe he’s my full sibling and my dad’s son. But nothing is 100% with my family. I was lied to about my other sibling and the real dad for a lot of years.

The representative of the estate (related to us) is telling me based on the will and his birth certificate the inheritance is mine, it’s what my grandparents wanted. She said he can contest it if he wants but she isn’t sure he’ll succeed. She doesn’t think I need to share. She said they wanted me to have it.

I’m just so lost as to what to do. Get it all and split afterwards? Keep it all?

He’s also trying to force me to split between my mom and sibling that isn’t related to my dad. My mom is guilt tripping me saying she deserves to be in on the split too. She actually found out about the inheritance first and made it sound like I HAVE to split it with everyone. So there is a lot of pressure happening, I finally asked everyone to stop talking to me as I don’t even have the will yet. This is the most they have ever talked to me in one week since I became an adult!

This is big for my family, it’s around 150k. We have 4 kids. I could start investing and help set them up for a future. My spouse and I aren’t money driven people… we live within our means, drive 20+ year old vehicles. We own a house on a lot of land. We like simple. My siblings and mom are all very money driven.. so I know all they see is dollar signs. And my mom and brother are very well off. My dad set my mom up for life before he passed away. She gets 6k a month. She blows it all. But it’s not my money so I just shrug and move on. If she needed it, I’d share. That would be easy.

But I also feel guilty if he is my bio brother.

*my grandparents did leave one of my dads children off of the will, on purpose, because she’s been a drug user her entire life. (Different mom, I have never met her) So I know they did put thought into their will.

Any advice as I wait for the will?