My mom wanted to redo her bathroom, this time it was only wall paper to start & one of my aunts (her SIL) badgered her way into 'helping'. Well the wall paper came out bubbly & crooked & my mom was NOT happy. She didn't want her help in the first place b/c the SIL did her own b/r & mom saw how IT turned out so she tried to be nice & say she liked it but it really does look bad & not to mention a waste of wall paper. I have another uncle (the SIL's brother) who wanted to 'help' me put a deadbolt on, well let's just say, no matter how I tried to insist I hire a locksmith, he wouldn't hear of it so after a lot of 'badgering' I reluctantly let him 'help'. Let's just say, he not only made a mess of my metal coated door but the lock never got installed. I was NOT happy. As a suggestion, what about little by little, if you can, redo it 'right'. Maybe doing it a little at a time, it wouldn't be as noticeable. Relatives can be a very touchy subject as they can take everything the wrong way...I have a few of my own like that so I can understand your problem. I would say nothing just to keep the peace & redo it to your satisfaction & IF anything is said, just say that while you appreciate his efforts, you had something a bit different in mind or you can just be straight up & just be honest. Point out what's wrong so he can see for himself compared to what the other room looks like & let him know that while you appreciate his efforts, the job just wasn't done as well as the first time & you feel you have to redo some aspects of it. Sometimes honesty is the best policy. Sorry you hafta go thru this, it's nice when relatives wanna 'help' but it's usually better in the long run to hire a professional. I wouldn't have, however, paid him anything unless the job was done right but that was your decision but I'd advise to next time, hire a professional.