Back in November, three Pennsylvania Republicans won seats in Congress by tight margins.

Six-term Republican Rep. Ryan Mackenzie's district borders, for a couple miles, the one that his mother was elected to in November. Freshman state Rep. Milou Mackenzie, 70, an interior designer and former schoolteacher, is also a Republican. “It was really awe-inspiring” to be sworn in together, Milou Mackenzie said. Rep. Lana Greenfield took over the House seat of her son, Sen. Brock Greenfield, in 2015 when he switched chambers. In Ohio, state Rep. Gayle Manning holds office across the legislative hall from her son, state Sen. Nathan Manning, a fellow Republican.