Hi there - from my Home (Spousal Sponsorship in-land Applications 2017 timeline and updates) to here hehe
For Section 4.1: Information of your family members. If you sponsor your husband only, and you guys don't have children yet --> so you fill
your information (sponsor) here.
***Because according to definition of "family members" on CIC:
"A spouse, common-law partner, dependent child or dependent child of a dependent child (grandchild), who plans to immigrate to Canada with the principal applicant. Accompanying family members are included on the application."
http://www.cic.gc.ca/english/helpcentre/glossary.asp
---> After that, you have to tick at Oui.
After ticking at Oui, there is a box, please keep it blank.
For 4.2 & 4.3, if you don't go with other family members, so write N/A.
Make sure
For section 2 & 3: You fill principle applicant's information.
For section 1: You fill sponsor's information.