"Titta!" or "Se!"

My last entry about the five mother tongues
in our family came from this story my
mother told me today:

My mother's mother tongue is Swedish.
After she married my Norwegian father
and settled in Norway, she started to learn
Norwegian, mostly by reading Norwegian
newspapers, by talking to my father,
and by attending a cooking school here
in Moss.

When I was a baby, she was showing me
something, using the Swedish word :
"Titta!" (Look!)

One of my Norwegian aunts quickly
pointed out that she must use the Norwegian
word "Se!" instead.

Mother tongue?