how often do they see them? Does your LO recognize them?
My lil bro (who Im extremely close to) flies home just about every 3 months for a week+ and at DS' bday time (around thanksgiving time).
He came in today and was greeted with the biggest laughter from DS (15 months now) He was super happy about the joyful greeting. Def recognizes and points to his "samchoon" (uncle in korean) now.