The brother of the Peterborough Labour MP Fiona Onasanya has admitted perverting the course of justice by lying to police about who was driving a speeding car.
Festus Onasanya admitted three counts of perverting the course of justice, a week before he was due to face trial with his sister.
- Watch a report by ITV News Anglia's Political Correspondent Emma Hutchinson
Ms Onasanya, 34, and her 33-year-old brother were jointly accused of misinforming Cambridgeshire Police about who was responsible for driving a speeding vehicle on 24 July 2017.
It was alleged they named a man called Aleks Antipow as being behind the wheel to avoid prosecution.
The MP's brother, who lives in Chesterton, Cambridge, pleaded guilty to perverting the course of justice in relation to the incident.
He also pleaded guilty to two further charges of perverting the course of justice, which involved blaming someone else for two separate speeding incidents on June 17 and August 23 last year.
The singer, who is on a tour of the Midlands and Scotland with his band, was bailed by Judge Nicholas Hilliard QC at the Old Bailey.
Festus Onasanya is due to be sentenced at the conclusion of his sister's trial.
Ms Onasanya, who was a solicitor before her election to Parliament in June 2017, is a Labour whip, meaning she is responsible for party discipline.
She has denied perverting the course of justice and faces trial at the Old Bailey on November 12.