Spencer, 26, is not keen to start a family just yet but his wife Heidi, 23, really wants a baby and has said she will do what she can to get her way.
Heidi's sister Holly, 26, usually clashes with Spencer but agreed that they shouldn't have a baby if they are both not sure.
She said: 'It's really unfair. You cannot bring a baby in this world when one of the parents is not ready.'
She added: 'To be honest, I think they should reevaluate their whole relationship because they're not on the same page about a lot of things.'