UPDATE 1 — Police arrest Pakistan ex — PM Imran Khan's sister in Lahore ahead of party's planned march
(Adds government notification, context, quote from close aide) By Mubasher Bukhari LAHORE, Sept 20 (Reuters) — Police arrested Aleema Khan, the sister of Pakistan's jailed ex-prime minister Imran Khan at her house in Lahore, a Pakistan Tehreek-e-Insaf Punjab spokesman said on Sunday, ahead of a planned protest march by