"There is no specific test or set of duties, responsibilities, or factors that will definitively establish an in loco parentis relationship ... There is even some difference in opinion between the drafted FMLA regulations and the [DOL's] interpretation as to whether an in loco parentis relationship requires both financial support and care, or whether one or the other is sufficient.... [A] sibling could be a covered family member if -- and that can be a big if -- an in loco parentis relationship exists between the sibling and the covered employee."  MORE >>