Invite friend or relative's kids to your place, give them in advance a toy that your son would have interest in so that your son somehow need to communicate or play and share with the little guest.
Hi CarChu,
Thanks for your reply.
I bronght BB to Grandma's house to play with her 3 cousins, she cried for 15 mins. No play with them, just watched them played and sang. Maybe I should invite her cousins to my house instead of bringing BB to Grandma's house!!!!
Young kids are difficult to understand. Your baby might insecured in someone else house, might act different in her/his own place "Dei Tao" showing off her/his own toys.
If you plan to invite kids, better coordinate with the adult to bring along some interesting toys or even prepare a fun toy as a little present to your little one.