I have a radiant Family Heirloom quest that I cannot complete, because the quest arrow points to nowhere, and the item in the chest does not recognize I have it. I used the "completequest" console command, and that completed the quest, but the companions leaders still think I am working on that and will not give me new quests. Is there anything I can do?

have you used the setstage command?

setstage cr06 200

or... install the unofficial skyrim patch and load an earlier save, as they fixed alot of quests