What should I put for 3a? No. of persons included in box #3 of IMM0008 form.Current undertaking means sponsorship applications that are currently being processed and no decision has been made (i.e not this one that you are trying to fill out as it hasn't been submitted yet).
What about No. 5? Your spouse or Common-law partner if not included in 3 above.
Like I mentioned, I'm sponsoring both my parents with my spouse as a co-signer.