Re: numerous quests bugged/ can't complete
What quests do you have active at the moment? There are quests that can't happen concurrently.
eg. If you have the restaurant quest running, you can't have royal lineage quest going.
A good way to think of it is this:
You can have 1 main quest going at a time (These happen sequentially)
You can have 1 side quest going at a time. (Spellcasting quest, Restaurant, Royal Lineage etc)
You can have 1 weekly reward quest.
You can have 1 social/neighbour quest.
I'm wondering whether it's a case of you having the quilting quest going (A side quest) that is preventing you getting the castle quest.
Hope that helps.
Dave