If you have a sibling but haven't spoke to them in more than 12 years, are you ok with the sibling building a relationship with your child without being there?

Ultimately, my only sibling, my brother, whose 26 wants and has been building a relationship with my 2 year old son since about 6 months old. But the problem is that before my son, it had been over 10 years since we spoke. My husband and I left our son on at least 2 saturdays a month with my parents, his grandparents, from 6 months to 21 months. On these saturdays, they'd take my son over to my brother's house which we were always concerned about. We had expressed concern before multiple times thinking he'd try to be a part of our life, not just our sons and it's been just the opposite. I've not mentioned my brother's and I past because it was an awful one. It was extremely rocky to say the least. Growing up, he stole my college money for drugs, holds grudges without speaking of what the grudges actually are, shamed me because I don't believe in religion, has said I'm an embarassment because I believe in science and truth and not God, and whatever else. He had suffered a concussion in high school and that's literally the last time we spoke. Now that he's grown, he's an alcoholic recluse is what My parents have told me. My parents obviously have an awful relationship with him as well. They pay for his mortgage, electricity, water, food and anything he needs. My question is, are you ok with your sibling whom you haven't spoke to in forever, building a relationship with your children without you ever being there considering the tumultuous and non existent past?

I must face them through family mediation very soon so I wanted to see what other's thought. Thanks.

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