My wife and child are arriving next week at Birmingham airport in the UK. They would have good amount of luggage. Is it possible that I could go inside airport at the luggage collection point to meet them?
It is quite likely that you can get a gate pass. This is like a boarding pass, but would allow you to go to their gate to meet them. Note that this will only be an option if they are flying domestically. If they are clearing customs and immigration in Birmingham, then you would likely not be allowed to go to them as you would have to clear customs yourself.
Speak to the airline that's flying your family as soon as possible and ask if you can get a gate pass at Birmingham airport. Just explain that they could use the help dealing with their luggage. If you qualify and your airline issues such passes at that airport, you'll pick up your gate pass at the check-in counter an hour or two before the flight arrives, just as if you were flying yourself.