Would you ask for child support and back pay for 12 years?

A friend of mine has a 12 year old, she cheated on her boyfriend and hooked up with a guy at a party. When the child was 2 the bf did a dna test and found out the baby wasn’t his and left her. She knew it must be the guy from the party but never contacted him. So he has no idea about the child and now the child is 12. Well apparently recently she found him on FB and she stocked his profile. He just got married and had a baby and bought a house. There is a picture of him his wife and baby in front of the house they just bought in another picture it shows they just celebrated their 11 years of being together anniversary and one year of marriage. She said that the house is huge and the cars in front are really nice, so she thinks he makes really good money now. She wants to message him asking for a dna test and then file for child support and back owe for 12 years.

I think it’s kinda sad she only cares about it now because she thinks he makes good money and she never cared to even tell him about the child for 12 years. If it was me I wouldn’t demand any child support for a child she didn’t even let him know about for this long. What would you do?

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