caught my dad talking to underage girls, idk what to do

okay like i will take this down in a bit.
yes i am posting this here too because i want opinions of people my age.
i don’t want to lose my dad but he’s talking to 14-16 year old girls constantly, he told them likes them young, he likes used girls underwear and a lot of nasty stuff, i won’t say here. he uses Skype and a anonymous website so that’s how i saw on his computer, he’s getting married in a few months i don’t want my whole house to hate me, it would change everything and leave my mom not stable financially since he’s the only provider, i have 8 siblings and we all love him a lot, he’s a really great dad too. i found out a couple weeks ago, i thought he would stop. what would you guys do besides calling the cops (seriously)

edit my siblings can’t work they are kids, i’m the oldest here (16) my mom doesn’t work because she’s trying to get pregnant again, and she takes care of us. my mom doesn’t have family here either.

another edit.. my dad never wanted my mom to work, he just wanted kids, my dad owns 2 very successful solo businesses in our town so we live very comfortably, obviously only without him then we would be unstable financially