←
West Frisian de (cognate)
←
West Frisian dy (cognate)
←
Proto-Germanic *sa (inherited)
←
Proto-Germanic *þiz (inherited)
←
Proto-West Germanic *þa (inherited)
←
Proto-West Germanic *þiʀ (inherited)
←
Old Frisian thī (inherited)
←
Old Frisian thī (inherited)