Investment income is usually something like interest, ex: you own a bond and you get paid a small amount regularly as long as you own it.
Capital Gains/Losses occur when you sell something, ex: you sold some shares or a building. https://turbotax.community.intuit.ca/replies/2647660
On a T5008, box 11 Indicates the Recipient type.
1 = individual
2 = joint account
3 = corporation
4 = other, e.g., association, trust (fiduciary-trustee, nominee, or estate), club, or partnership.