premise: Two elderly men having a conversation.
hypothesis: Two elderly woman having a conversation with their children.
explanation_1: Just because two men are having a conversation doesn't mean woman are not involved in the conversation as well. Not all conversations are about children.
explanation_2: Sentence 2 does not seem to correlate at all to sentence 1.  Sentence 1 mentions elderly men while sentence 2 mentions elderly woman, which is grammatically incorrect.  The only assumption to be drawn that would make sense is that the park has numerous individuals including the elderly men and the elderly women who are having a conversation with their children.
explanation_3: No way to know there are woman or having conversation with their children.
premise_logic: exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & with(x3,x4) & n_child(x4) & of(x4,x1) & n_thing(x1) & n_conversation(x3) & (x1 = x2) & n_woman(x1) & a_elderly(s1) & Theme(s1,x1) & card_eq_2(x1))
premise_sim: exists e1 s1 x1 x2 x3.(v_have(e1) & n_man(x1) & n_conversation(x3) & card_eq_2(x1) & a_topic(x1) & a_elderly(s1) & Theme(s1,x1) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))
hypothesis_sim: exists e1 s1 x1 x2 x3 x4.(with(x3,x4) & v_have(e1) & of(x4,x1) & n_woman(x1) & n_thing(x1) & n_conversation(x3) & n_child(x4) & card_eq_2(x1) & a_topic(x1) & a_elderly(s1) & Theme(s1,x1) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))