Hi mate. I have a 19'year old who freaks every time his sister 13 sings dances etc. I just try to calm him down by explaining that his sis will turn it down as a compromise. It normally works but I try to nip it in the bud. Not sure if it's M situation or just teens. Hard station buddy but we have the kids so who's the real loser ? I also keep the kids doing things together but playing cards watching movies ( on Star Wars at the moment ) and having a set night for things. Still gets tense but is keeping us going so far. Take mate. It can only get better (. I think)