Syntax: kinship <target> discuss <item>
kinship <target> pay <key>
kinship <target> trade <item> for <item>

The bonds between racial kin can be leveraged to trade for armors and weapons,
or even pay for keys. The bond of kinship is not strong enough to overcome
common sense, and they will want something of similar value to be convinced to
part with their equipment.

You can discuss with your kin to see if they would even be willing to part
with their item, and in the case of keys learn how much copper it would cost.

See also: REQUEST

That solved one problem for me.