Long story short, I have entered DD2 (8) for a talent competition - she is very outgoing, confident & interested in this area as she loves performing. DM has disapproved as I have not put DD1 (10) forward as well.
DD1 is very talented clever girl (I know their mother so will say that about both DDs) but she has struggled with severe anxiety & behavioural issues over last 2 years so I would not feel happy signing her up for something she could maybe not cope with or feel under more pressure, however if she expressed a desire to do the same or another activity I would support her.
AIBU to encourage one in something without including the other (without drip feeding I don't think DM's reaction would have been the same if I'd signed DD1 up for something and not DD2 but that's by the by, they are individuals right?)