Huge fight over babies gender?

First of all- we have 3 children and with the first 2 we found out- with the 3rd we didn't. We are expecting number 4 and ultrasound is later this week.

I don't want to find out the gender. After enduring pregnancy and a c-section- having the gender be a surprise at the birth is something I look forward to and am looking forward to.

For some reason all of the sudden he is stuck on finding out- he claims "my family NEEDS to know" and he has himself convinced he and they can all keep it a secret from me.

That is a total lie- he never can keep secrets and since this is our last baby- I would be crushed when it slips out.

Second of all- his family who "needs" to know- has never met a single of our children, or even myself. NOT ONCE- they live all over 10 hours away and never can manage to find the time to come meet their grandchildren. So that pisses me off- why does a family who has nothing to do with us "NEED" to know the gender before the baby is born?

We got into a HUGE fight today, because i was upset and told him I really don't want anyone to know- and he basically told me, that i can not find out- but he is finding out- and if it upsets me that much- then i just need to learn a better way to deal with it.

GRRRRRRRRRRRR My ultrasound is this week and I seriously want to just cancel it or get a divorce- I don't know what to do. =(