Ukrainian postgraduate student Pavlo Lapshyn, 25, pleaded guilty at the Old Bailey to the murder of 82-year-old grandfather Mohammed Saleem in Birmingham in April and plotting to cause explosions near mosques in the West Midlands.
The father of Pavlo Lapshyn, who killed a Muslim pensioner and planted three bombs near mosques, told ITV News his grandmother was a Muslim.
Sergey Lapshyn added that the news was a "disaster" to his family: "What is there to say? We've got a disaster in our family. We just hope not everything is attributed to him, at least not the murder. I just can't believe he could murder."
A Ukrainian student has admitted stabbing an 82-year-old Muslim pensioner within five days of arriving in the UK.
Police have released images showing Ukrainian student Pavlo Lapshyn preparing for and carrying out attacks in the Midlands.
A timeline leading up to the conviction of Pavlo Lapshyn, who murdered pensioner Mohammed Saleem and set bombs off outside mosques.