Any loan from a family member is likely to be treated as a ''soft'' loan ie not intended to be repaid. If it is to be counted, there would need to be some sort of loan agreement, a schedule of payments and evidence that repayments have been made/are expected.
If this isn''t a real loan at all, you can raise questions about it when you complete your questionnaire. I wouldn''t worry unduly.
Are there children involved? Are you still living in the FMH?