WARSAW, Poland — In an apartment on the outskirts of Warsaw, 5-year-old Olek fills his home with the twangs of a ukulele while his 2-year-old sister, Jagienka, sings along in a strong, off-key yowl. Their mothers, Ola and Karolina, smile at the cacophony: the sounds of a happy family. But here in Poland, this family is not protected under law. “Starting a family like ours, we knew what kinds of obstacles we’d be facing, and we always had hope,” says Karolina. “I remember when we voted last October, we told each other, ‘We are about to change the world.'”