Help !

OK so my cousin reached out to me I haven’t talk to her in years and she reached out to me because she’s pregnant and the babies father walked out on her, he lied to her so many times and told her he wanted to marry her take care of her and that he loves her and he wants to take care of the baby, he had recently left his previous girlfriend who also has a baby with him because apparently she cheated on him she told my cousin that he was still trying to talk to her, so the day that she found out she was pregnant she came over to my house she took a second pregnancy test and it was positive but she was cramping REALLY bad & didn’t know why so we went to the ER she is about 3 weeks & 3 days pregnant. He blocked her on everything so we reached out to his mother & sister in hopes that they would let him know, NOPE! They went bitch mode. The sister told my cousin she’s blocked bc no one likes her skanky ass. & the mom said she needs “proof” I got angry and told them that idc if they believed her or not, she’s pregnant, that baby is their family & he made promises he obviously could not keep. She said he would never do that, lol thank god we kept the screen shots & sent them to her. Idk what to do I’ve been help her as much as I can... I’m with my baby father, we’re married and happy.. but idk what to say to make everything better....