These would be the amounts of income from other sources. An example would be if the veteran is eligible for superannuation benefits based on his or her military service, for instance, amounts that the veteran would be receiving through Canada pension plan, those types of income supports.
The whole intention of the retirement income security benefit is to ensure that there is a minimum level of income the family does not fall below. That's why in the calculation of it there will be consideration of income sources other than just those that are provided through Veterans Affairs Canada programming.