I'm happy

My brother told us yesterday that he and his girlfriend are going to get married the next year in December*. He is 26 years old but he's the only man of in my family so he is like our "little boy" for us. However we are happy for him; in fact we are prepared for the a party.**

*this sentence say that they will get married in Dec 2021. If you mean Dec 2020 then you should say "get married in December" instead.

**This sentence say the party already happened. If you wanted to say the party will happen in the future, you could say, "we are preparing for a party".

Sorry if I misundestood a part or two. Keep improving!

I'm happy

My brother told us yesterday that he and his girlfriend (will)/(are going to) get married next December. He is 26 years old but he's the only man in my family so he is like "the little boy" for us. However, we are happy for him. In fact, we are prepared for the party!