As a mum of a DD in her early 20s who lives with a lovely DP and has a baby, how do I know when to step in and when to back off? I think he is lovely, he works long hours, buys her presents, takes her out and always seems kind and loving. DGS gets tons of attention from both. But every now and then DD gets angry with small things her DP does and it looks unfair to me. But how do I know there isnt more to it? Do I stay out of it, do I have her corner even if it looks like she is in the wrong? Or do I say "you're out of order?" To her? I just want to know what the danger signals are so I can know when to worry and when to leave them to it!