advice

alright so I'm not getting rid of my male cat. he was either going to my sister who has his brother or staying with us. I need help with how to fix his bathroom issues. he refuses the letterbox. we've tried 5 different kitty litters. he uses boxes but he pees so much it soaks through. I'm pregnant so clearly it'll be my husband fixing it but we don't know where to start. can anyone give us advice. our female cats have not issues going where they are supposed to go.