You should file two Schedule C's and divide income and expenses according to each interest, or in any manner you deem to be reasonable.
See the following link for more details
https://ttlc.intuit.com/questions/3308676-i-am-married-filing-jointly-with-husband-and-wife-ownebu...
To add a second Schedule C:
·
Type in schedule c in the search
box, top right of your screen
· Hit the Enter key
·
Click jump to schedule
c in the search results
·
Arrive at Your 2017 self-employed
work summary page
Click the Add another line of work button, follow the prompts and online instructions
[Edited, March 19, 2018, 06:00 EDT]
