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Liliaceae
They are part of the Liliaceae family.
NO. Turnip belongs to Brassicaceae (old name: family cruciferae). If you mean tulip (not turnip) then yes it belongs to family liliaceae.
Bryan Douglas Ness has written:
'Systematics and evolution of Calochortus (Liliaceae) with special emphasis on subsection Nudi' -- subject(s): Liliaceae
Tulip plants are of the genus Tulipa of the family Liliaceae.