A 73-year-old Kenyan man has moved to court seeking to have his son surrender 20 per cent of his earnings for his maintenance.   Gideon Kisira Cherowo, from Biirunda in Trans Nzoia County, claims that his 48-year-old son Washington Chepkombe Cherowo abandoned him despite having contributed to his education until university level.   In the papers filed at Kitale High Court, Mzee Cherowo, stated that his son does not send him any upkeep even though he is currently working at the …