Can you be absolutely sure that the children are spending an equal amount of nights with each parent?
Its not uncommon where parents have an amicable shared parenting arrangement and for the lower-earning parent to claim the child related benefits, meaning that both homes are on an almost equal parity income-wise, and that the children aren''t going from one reasonably well-off household to one that is struggling financially.
Sometimes other people''s private arrangements are just that - private
Unfortunately the current system is that only one parent may claim the child benefit. The person that does is eligible to receive all child-related benefits (income support, housing benefit, WTC, CTC etc). That person receives the entire benefit, regardless of the number of nights they have.
If separated parents get on they may well come to some arrangement, as Ruby suggests, or perhaps one parent may receive the child benefit (in order to qualify for housing benefit) but pay it as part of their maintenance to the other parent.
You can''t know what their private arrangements are, but on the face of what you''ve written in your post I can''t see that anything untoward is going on.
What makes you think that this person is doing anything wrong or that it has anything to do with you? Its not as if they are doing something illegal such as claiming benefits whilst working.
As Ruby and U6 have rightly pointed out, private arrangements are exactly that. If either parent has a problem with it it is down to them to address it. There is no wrong doing and so nothing to report.
As Ruby says, some people make private arrangements about these things. That''s something you can do if you are amicable.
I know two families with 50:50 shared care quite well.
In one of these one of the children officially lives with one parent, and the other with the other. This means that they both claim child benefit etc., for one child each. I suspect that in April he will lose his right to CB so I would imagine that she will then claim for both of them.
In the other family, the mother has a disability and can''t work. They have agreed that the children will officially live with her so that she can claim more benefits, giving them a better standard of living. He also willingly pays child support, which also equalises the income of the two households. Neither of them has much money, so the loss of these benefits is noticeable to him, but he thinks it''s fair that the children''s lifestyle in both houses is more or less equal.
What business is it of yours what she is claiming, anyway?