In “Father Knows Best” in the 1950s,...

In “Father Knows Best” in the 1950s, Robert Young was the parent with all the answers. In “Marcus Welby, M.D.” in the ‘70s, he also had a remedy for most problems.

But in “Conspiracy of Love,” a new TV movie airing Sunday on CBS (9-11 p.m., Channels 2 and 8), he runs into a stonewall: an ex-daughter-in-law who gets a restraining order to keep him from seeing his granddaughter.

Drew Barrymore (pictured with Young on the cover) plays the tomboy girl who’s charmed by her grand-father’s embellished stories of past greatness.

Glynnis O’Connor is the mom who seeks to keep the two apart, feeling the old man is a bad influence on her daughter. And Elizabeth Wilson is caught in the middle as the grandmother.