Reincarnation is a clean slate other than what is energetically programmed and tied to the soul. Unless you have evolved your soul past a certain level to the point your 'higher mind' can incarnate with full past life knowledge (this is near miraculous and happens far in the MO process), you won't remember them even if you do incarnate at the same time in the same place. You will have to meet and court each other again.
And yes, some pairs of people actually do this unconsciously, but they still don't remember who the other person is, even if the attraction is overwhelming and inexplicable. People can also die, move away and other things.
Sometimes families incarnate together but I have never seen this happen at the same time. There is usually a gap of decades. And again, family or not, they forget the past lifetime.