Would you do it?

My husband grew up without his dad in his life. From what I've heard, he met him once when he was around 7 or 8, but never saw him again. He lives about 1500 miles away and has a whole family, wife and grown kids, a grandchild. My MIL told me his name so I did a little digging. I found his wife on Facebook (he doesn't have FB). My MIL was a shitty mom to my husband. She's been a drug addict his whole life. So my husband really didn't have parents growing up. He could care less about his dad. He resents his dad for leaving him in that situation and for basically acting like a piece of shit the one time he met him. My husband and I have a child now. For some reason when our child was born, I started becoming more interested in my husbands dad. Would he want a relationship with his son and grandson now? Does he wish he knew how his son was, but just didn't have the means to find out? Is my husband bluffing and really actually is interested in knowing about his dad? Well now the answers are literally a click away. i could message them on Facebook and ask... My husband doesn't have FB and he's not a super sleuth like me, so he never would've found them even if he had wanted. But I did. They are right there, all I have to do is message them. So my question is... would you? If I ask my husband about it first, hes going to put on that tough "I don't give a shit about him" front and tell me to leave it alone. So should I respect that... or actually try to make contact and gauge how receptive they are? Thoughts?