TS, just be natural and be urself.. nothing to scare about.. if you are scare, then jus keep quiet and smile..
when they ask u things, u jus answer.. is ok for wat.. slowly then, u will get used to it..

my bf stay with his grandma.. almost everyday im going there for lunch.. if i din go, his grandma will ask "y i din go and so on"..

they treat me nicely.. i didn't bought anything when i go also..

jus occasionally will buy something for them.. depends on what festival..