Apologies in advance for the length of this.
So my 13 week old boy/girl twins, who share a cot, are not too hard at all overnight. TG will wake once between 9:30pm and 6am, which at 13 weeks I'm thinking is pretty darn good! She even slept through last night. TB will wake twice, and is often unsettled from around 5am onwards. So far so normal really.
What I'm baffled by is our evenings. We have a 4 yo son, and so have integrated the twins into the bedtime routine, which ends with us all having a story on our bed (twins get a top up feed) and then older son into bed (in his own room) and twins into their cot (generally already asleep or very nearly) by about 7:15. The twins then sleep for at most 45 minutes before waking and being very unhappy about being in their cot. They will settle when cuddled, and if we bring them downstairs they will sleep in our arms or in their bouncer chairs. But there is no putting them back down in the cot at this point.
They then get a bottle feed at about 9pm, after which they go in the cot perfectly happily and sleep until maybe 1am or 2am.
Are we doing the wrong thing by bringing them down if they don't settle? Should we be "persevering" and keeping them in the bedroom, dark etc? Selfishly we didn't want to sacrifice our evenings over Christmas and new year doing this. Is their sleep cycle out of whack, or do we just accept that they're too young for a "bedtime"? I don't unstandardised how they can be so happy to go to bed at 9:30 and yet so unhappy just an hour or so earlier. Answers on a postcard please, we are baffled!