My sister has so many lice. what should we do?

The whole family: Should be treated. Tx of lice requires accurate identification of nits ; / or lice. A pediculicide is usually used- otc like nix (permethrin) or rid or prescription meds like lindane or malathion. Work carefully through hair ; remove individual nits. Purchase a special lice nit comb to aid you. Check for nits ; remove as seen over the next 7 to 10 days. If there are nits after 7 to10 days – a 2nd pediculicide.