Complete the sentences. Marta is Alvaro’s sister . 1 Alvaro is _________ brother. 2 Cecilia is _________ sister-in-law. 3 Eduardo is Cecilia’s _________ . 4 Marta is Manuel’s _________ . 5 Marta, Pedro and Alvaro are Cecilia’s _________ . 6 Pedro is Eduardo’s _________ . 7 Marcela is _________ mother-in-law. 8 Juan is Alvaro’s _________ . 9 _________ is Marta’s father