DENVER—Parents could be able buy alcohol for their children at Colorado bars and restaurants if they were 18 and older but not 21 yet, under a proposal by a Republican lawmaker.

Sen. Greg Brophy is introducing the bill for the legislative session that begins Wednesday. He says he thought of the proposal because he and his wife recently took their daughter to dinner to celebrate her 20th birthday, and she couldn’t have a drink with them.

Brophy says he also wants parents of returning servicemen to be able to buy their children drinks at bars or restaurants.

He says the bill would allow parents to buy their adult children drinks in any place that allows on-premise alcohol consumption. Wisconsin has a similar law.