I don't think that you can use an attribute filter to do that. An extended_attribute_filter, maybe, but much easier, I think, would be to fetch all the nodes then 'filter' them in the template, using children_count. Assuming you've fetched the array of nodes as $list, something like:
Eq. After that i have fetched and checked with children_count that the objecvt have a child, then i only want it to show say top three objects. How do i limit it?
//Milad
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