Picture the Wyeths in their grand Palm Springs living room on Christmas Eve: Dad is a gentle Republican politico and John McCain doppelgänger. Son is a goofball TV producer. Daughter is a lefty writer. Mom is a hilariously cruel Reagan-worshipper. “You are never going to meet anyone,” she says to her daughter, “if you continue to dress like a refugee from a library in Kabul.” That living room quickly becomes a family battlefield, and watching the sparks fly between mom (Pamela Reed) and daughter (Marya Sea Kaminski) is like watching someone welding. (ACT Theater, 700 Union St, acttheatre.org, 7:30 pm, $57–$62, through June 30)