Facebook and talking behind peoples backs

So my hubby's Aunt has me all upset again..asked if we would take her kids..more like teens at 15 and a month from being 18.. With us on or vaca next week and we said sure but now I see on Facebook she is looking for ANYONE else to take them it really irratates me all the time she bad moths it's and then askes us to do stuff for her.. Grrrrrrrrr