Lazy to-be father in law

Have been dating my gf (24) me (24) for almost 7 years and I hope to get married soon, her day who’s almost 55 hasnt worked in over 20 years and refuses to get a job, (mom just basically enables him and their 21 year old son who doesnt work or school either) just a habitual liar and lazy guy who wont fix anything in their house or anything on their cars, I hate being around the guy and I hate that this is going to be my kids grandpa one day 😭