I’m same boat with you I’ve only met my eldest daughter in 6 about 4 times after her mum ran off with her and put another man on the birth certificate,the kids will always come looking for answers as they get older the same way when my father left I went looking for him to see he wasn’t worth looking for,stay strong and hopefully everything will get better in time mate I hope you find your children soon and make up for all the lost time. Deeply sad to hear this good luck and all the best mate! Stay strong