[But... option 3?]

I didn't try it, but I believe you can move quest items from the stash into your inventory, and you can move items from your inventory into a container, which opens up the option of putting the baby in a crate somewhere and just ignoring the quest.  I suppose that would qualify as yet another way of solving this quest...

 

I tried to put the baby in inventory to leave her in stronghold, not work.

[But... option 3?]

Kill both sides and leave the child in your stash the entire game......

Ditto.

[Galawain's Maw]

The unique option (convince the bear clan allow Sul's cubs live if she died, then she will fight the bear one on one) spoil the outcome for me?

[How did you end the 'Blood Legacy' quest?]

I don't bring mothher with me so I did not know that I can save her. My character Killed her and let Harrond live.

 

I wish there is a option to spread rumor about the lord, I don't think he's deserved to die but let him go like nothing happen make me very dissatisfied.