Mine often double team me and will not be left on their own to fall asleep.
So method when DH is not here is to plonk them both in the same bed - usually mine and then jump in too. I will then jump out and relocate DD2 as she can be moved. DD1 is too big and will wake. Really we have decided the path of least resistance as the more upset prior to bed the worse the night seems to be.
Good luck!