Are the children glad to have Aunt Alexandra?

At first they aren't. THey find Aunt Alexandra the opposite of their father's liberal way of parenting. Scout especially dislikes having to conform to her Aunt's idea of a proper Southern lady. Still Aunt Alexandra does begin to show more compassion towards the end of the novel.

they find her rude and disrespectful in a way.

they find her not very caring. (Well, that's not true.) I don't know.