Poor Substitutes

Plot:

After bumping into a woman who might be Sarah's birth mother, she wonders whether to look her up. Bailey does, but is told she's not in the least maternal, so he pretends the name Robin Merrin was adopted later. Charlie realizes Kirsten neglected to get Owen enrolled in a good pre-school, which is urgent now Bill can't help out whole days any more. His last chance depends on a rule children must be potty trained, and Charlie simply can't pull that off. Justin sort of expected Julia to be jealous when his parents accept to host his English friend Allison 'Allie', but ...