Littlest: "Mummy, can girls have girlfriends?"
Me: "Yes, yes they can."
Littlest: "Can they get married?"
Me: "Yes. Girls can marry girls, and boys can marry boys, too."
Littlest: "If two boys get married, can they have babies?"
Me: "Well, they can adopt them."
Littlest: "What's that?"
Me: "Well, if there's a child who hasn't got a family, then the two boys could take it to live with them as their child."
Eldest: "Like on Tracy Beaker."
Me: "Yes! Yes, like Tracy Beaker. There are children on Tracy Beaker who don't have a family, so a couple could come along and..."
Littlest: "Is it like if you have a horse and it's too poorly for you to look after it so you give it to someone else?"
Me: "A horse? No, no not really, it's when a baby or a child becomes part of someone's family forever."
Littlest: "But horses have family! What about if you're ill and you can't look after the horse and you give it to someone else?"
Me (more perplexed): "Well, yes, that can happen, but..."
Littlest: "What about if you had four horses?"
Littlest: "And gangs of cats?"