1029.8.61.11.1. If, at the beginning of a particular month, persons have a bond of filiation with an eligible dependent child who is the subject of shared custody and in respect of whom each of those persons assumes at least 40% of custody time during the particular month, each of those persons is deemed to fulfill the responsibility for the care and upbringing of that child at the beginning of the particular month.
If persons are deemed, under the first paragraph, to fulfill the responsibility for the care and upbringing of an eligible dependent child at the beginning of a particular month, no person other than persons referred to in the first paragraph may be considered to be fulfilling that responsibility in respect of that child at the beginning of the particular month.