Baby shower for #2 - help.

La

I never had a baby shower with #1 (14m old) but we are expecting twins (19weeks) and looking at having a baby shower.

There are obviously extra things we need to buy for the twins.

I am going to so a BBQ at home so my husband can stay around as well.

Is it rude to ask for cash or vouchers?

If anyone has copies of their invites with wording can you please post below? Any help is much appreciated