Provide the theme summaries for the following conversation: 

Fiona: Hi there, are you back home?
Mia: still on the train :((
Fiona: eh??
Mia: DB for you! 50 mins delay!
Fiona: so sorry for you, how's Lucca?
Mia: thank goodness asleep most of the time. But had problems nappying her, a horrible toilet, dirty
Fiona: oh god! where are you now?
Mia: fuck knows! was nodding when your message came
Mia: approaching Stuttgart
Fiona: still a couple more hours...
Fiona: d'you feel like nodding off again?
Mia: no, I shouldn't, happy to text with you
Fiona: how was your visit?
Mia: as usual, too much food, too little exercise, mum and dad bickering about everything...
Fiona: doesn't sound a happy Xmas
Mia: somehow it was, strangely enough I love being there and listening to them. They've always been like that.
Fiona: good they're still so fit. How old are they?
Mia: dad is 76, mum 68, and very fit
Mia: <file_photo>
Mia: went tobogganing with both of them!
Mia: the one on the crest is me holding the baby, we're rotating
Fiona: great! so there was some exercise
Mia: a bit, but not too much
Mia: you know what? I'll have a nap after all. Lucca will wake me up anyway
Fiona: give me a ring from home
Mia: I will

Summary: 
Mia is on the train, close to Stuttgart with 50 minutes of delay. Lucca, her baby is sleeping. Mia visited her parents for Christmas. They are 76 and 68. Mia went with their parents tobogganing.