One toddler takes away the mouth piece of the other which makes him cry.
A toddler plays with his sister.
Two toddlers together may or may not be related.  There is no way to imply that the toddler plays with his sister.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(n_male(x2) & n_other(x4) & n_piece(x2) & of(x2,x3) & n_mouth(x3) & a_away(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_take(e2) & Recipient(e1,x2) & Theme(e1,x6) & Actor(e1,x5) & v_make(e1) & n_cry(x6) & (x2 = x5) & of(x2,x4) & n_toddler(x1) & card_eq_1(x1))
exists e1 x1 x2.(with(e1,x2) & n_sister(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_play(e1) & n_toddler(x1))