They ll most probably ask you. And you ll have to give them a convincing answer. Not just that you were able to secure higher points by making them unaccompanying.
Some of the valid reasons can be, frailty and age of parents, spouse's job prospects here, estrangement, separate living, contractual obligations here or maybe even some civil litigation that needs to be taken care of. The excuses are endless. However, you may need to substantiate it with enough evidence.
It is possible that VO may request documentation in support of your reason. So, whatever reason you give, make sure that it doesn't sound stupid and would hold its own or at least seems genuine, even if you do not have corroborating evidence in its support.
Anything else, and you may be barred from reapplying for five years, as you would be held liable for misrepresentation.
P.S - This route is not advisable. The risk involved is higher. Trust any information given with respect to this at your own perils.