Soundproofing an upper lower duplex

[Albert Olivarria]

I need soundproofing advice, I have an upper lower duplex and live in the lower unit myself. The sound from the tenants above is obnoxious, I can hear everything. My home was built in 1957 and there are hardwood floors under all existing flooring (carpet and linoleum). The floorboards also squeak and it doesn't seem to be confined to certain areas.  What are my options for decreasing the sound transfer, and reducing squeaky floors?