Catechism of the Catholic Church
D. Para. 238: Many religions invoke God as “Father.” The deity is often considered the “father of gods and of men.” In Israel, God is called “Father” inasmuch as he is Creator of the world (Cf. Deut 32:6; Mal 2:10). Even more, God is Father because of the covenant and the gift of the law to Israel, “his first-born son” (Ex 4:22). God is also called the Father of the king of Israel. Most especially he is “the Father of the poor,” of the orphaned and the widowed, who are under his loving protection (Cf. 2 Sam 7:14; Ps 68:6).
Para. 240: Jesus revealed that God is Father in an unheard of sense; he is Father not only in being Creator; he is eternally Father by his relationship to his only Son who, reciprocally, is Son only in relation to his Father.