In the following paragraph, determine if the numbered sentences are run-on sentences or not.

(1)Some parents refuse to become involved in their children's squabbles, they fear the children will resent the interference. (2)Siblings have different reasons for fighting, competing for space and playthings or for attention from a parent can turn playmates into rivals. Bickering is common and normal, but excessive fighting can be a sign of more serious trouble. (3)By adolescence, most children have worked out compatible relationships with their siblings, although they may still occasionally argue.