I think either the old lady or the pregnant woman should get the seat . I think the pregnat woman should get the seat because if anything were to happen to her ( like she falls or somone falls onto her while she's standing ect.) it could effect both her and the baby. Of course it depened on how mamy months pregnant she is but from the picture, it seems like she's at least 3 months pregnant but it would or could affect the baby whether she is heavily pregnant or not. I also think the old lady should get the seat because as you get older, your limbs get weaken so she may not be able to hold her weight on her legs as easily .