Read about how the Republican party undermines families by siding with business when push comes to shove. (Latest example: the recent legislation making it harder for families to declare bankruptcy yet doing nothing to curb banks' predatory practices.)
Did you know the Democrats were the original "pro-family" party?
SOME HISTORY may help here. The modern "family issues" are actually about a century old. The first openly "pro-family" president was a Republican, Theodore Roosevelt. Between 1900 and about 1912, he wrote and spoke often, and eloquently, about the dangers of a rising divorce rate and a falling birth rate. He celebrated motherhood and fatherhood as the most important human tasks, and described the true marriage as "a partnership of the soul, the spirit and the mind, no less than of the body." He blasted as "foes of our household" the birth control movement, equity feminism, eugenics, and liberal Christianity.
However, the Rough Rider was the only prominent Republican of his time to think and talk this way. The dominant wing of the GOP tilted in favor of the banks, the great industries, and -- perhaps more surprisingly -- the feminist movement. Indeed, as early as 1904, the National Association of Manufacturers had formed an alliance with the feminists, for they shared an interest in moving women out of their homes and into the paid labor market. When the feminists reorganized as the National Woman's party in 1917, the manufacturers' association apparently provided secret financial support. More openly, Republican leaders embraced the feminists' proposed Equal Rights Amendment, first advanced in Congress in 1923. The GOP was also the first major party to endorse the ERA in its platform.
Meanwhile, the Democrats consolidated their 19th-century legacy of "Rum, Romanism, and Rebellion": that is, as the party favoring beer halls, the new immigrants from Eastern and Southern Europe, southern agrarians, northern Catholics, small property, the trade unions, and -- importantly -- the "family wage" for male workers. This cultural and legal device sought to deliver a single wage to fathers sufficient to support a wife and children at home. The Democrats also welcomed the "Maternalists" into their ranks, female activists who -- while believing strongly in equal legal and political rights for women -- also emphasized the natural differences between the sexes when it came to childbirth and child care. They favored federal programs for the training of girls in home economics and for "baby saving," meaning efforts to reduce infant and maternal mortality. They fiercely opposed working mothers and day care. Under this Maternalist influence, every New Deal domestic program openly assumed or quietly reinforced the goal of a "family wage" and the model American family of a breadwinning father, a homemaking mother, and an average of three or four children.
In short, from 1912 until 1964, the Democrats were -- on balance -- the pro-family party. The Republicans, on balance, were the party of business interests and the feminists.
All this changed between 1964 and 1980 with the emergence of the "Reagan Democrats."