That story is so sad Jo! Poor little Peter, locked out and replaced. Sibling Rivalry is one common family theme I don’t think the show has actually touched on yet, either.
We have had parent/child issues galore, but all our main “children” are singletons. David HAD a twin but they killed him off fast.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass