Harry (Danny Glover), an enigmatic old friend from the South, comes to visit Gideon (Paul Butler) and his wife Suzie (Mary Alice), who haven't seen him for many years, who are delighted to see him again, and who insist that he stay with them for as long as he would like. Gideon and Suzie live in South Central Los Angeles, though they retain some of their rural southern ways, including raising chickens in the backyard. Harry has a charming, down-home manner, but his presence brings to a crisis the simmering trouble that is already in the familyâespecially as regards the younger son, Samuel or "Baby Brother," and his relation to his parents, wife, and older brother, Junior (Carl Lumbly). His disruptive presence is dangerous (his influence threatens to break up Samuel's marriage and seems to be related to the illness that puts Gideon in bed in serious condition for a couple weeks), but ultimately purgative: Gideon's extended family is much more cohesive as a result of Harry's visit. The storm accompanying the wound Suzie suffers when she grasps the knife that Samuel and Junior are struggling over during their climactic fight clears while the two brothers quietly reconcile (during a long wait in an emergency room) and, similarly, the simmering anger that Harry seemed to bring to a boil is also dissipated. Harry's death just before the end of the film suggests, ambiguously, that he has been to a degree a self-sacrificing savior of the family.

Question: Whose presence threatened to break up Samuel's marriage?
Answer: Harry's presence.
Alternative answer: Harry's presence.