My dad's new girlfriend is pregnant!?

keep in mind my dad is 54 and his girlfriend, Lyndsay, is only 23!!! i'm not sure if shes a gold digger or what, i cant tell. she seems a lot like a party type of girl and is very hot!! i wish my dad would reconsider this. i got to meet her briefly once and i would like to have her!! I knew had a 4-year degree and had a decent job, but didnt know where she worked. When I was at an upscale, large fitness place like a lifetime, I noticed her from a distance on the eliptical in her tight shorts and showing off her great and beautiful tanned legs!! wooooooo!!! When she got done i went and approached and introduced myself again, said, "hi, i'm Jerry's son, you remember me?" she did, we talked briefly. towards the end she mentioned something about the "good news" i asked what it was? she said, "Oh, didnt your dad tell you that we're having a baby?" i acted like he did, but i didnt really know about it. im still trying to imagine what it would be like to just get into bed with her, let alone make a baby with her! i remember my dad referring to her as "Hairy Lyndsay!" then realized down where he was talking about and then knew why he liked her so much! LOL! Can't blame him I guess. I just wish he wasnt having the baby with her because its a mistake. my two sisters and my half siblings that are old enough to care, think its a mistake too. He's had a lot of health problems in the last 3 years; he's had a gallstone, has an enlarged prostate, high blood pressure, had a few kidney stones removed and ped several and just recently ped 2!