My 3.5-year old son wants a vaimo

To clear thingsss up first, I need to explain that his dad calls me vaimo(wife in Finnish) sometimes, so here is how it starts...

.........

him: I don't want mommy, I want vaimo( what he really meant was i don't want you to be my mom, i want you to be my vaimo).
me: but mommy is already dad's vaimo, mommy can't be your vaimo any more.
him: but i want to, and i want a lot of vaimos...
me: what do you want a a vaimo for..
him: i want a hug.
.....

His work from kindergarten