Bert it is very normal for us ladies to walk/sit side by side w/ arms wrapped around each other, or hands on shoulders. As for the kissing your fiances sis, ill do the same as we are not accustomed in kissing/ hugging someone (male) 1st intoduced to us even he is a Filipino. Shaking hands is just fine to us.

When my sis bf was intoduced to us we just shaked hands and nothing more, we only had a chance to kiss him at the reception of their wedding.

And it is not normal for us to see someone kissing on public, hugging, showing public display but if you do that who'll see raised eyebrows and chit chatters. Probably you'll hear how "flirt" your girl is.