Do you know why your child is afraid of them? As they are still tour elders, would be good just to show respect and call them accordingly. As you have said, go over if they invite you, if not, just give them a call to wish them good health and blessings for the new year. If go for reunion dinner before 5th Feb, just bring over some CNY snacks and maybe fruits for after dinner. If go on or after 5th Feb, bring oranges and ang pows for the in-laws (anything like $66, 68, 88 etc) ending in 8s are fine. Please avoid digit 4. Kids below 16 years can range from $8, 10, 12, 18, 20 etc depending on how well you know them, and more for older kids. If you want to avoid giving out during the visit, just find an excuse to leave after a while. From another view point, it's good to show your child some new customs. All the best.