Another teenager admitted murder earlier this year in relation to the break-in and was jailed in May this year for 14 years.
Mother-of-two Mrs Lovell left Suffolk in 2011 with her daughters and her husband Lee, who was also injured in the attack.
The latest sentencing hearing was told by prosecutor David Nardone that the second teenager’s criminal history was lengthy.
The previous judge-only trial heard the defendant, who suffered cognitive impairments, did not stab anyone himself, but had just been released on bail, in connection with unrelated offences, on the day of the break-in.
In sentencing, Judge Michael Copley recorded a conviction for three of 21 offences including those related to the Lovell home break-in.
Mr Lovell said he felt “pretty let down” following the sentencing, reported Channel 9, external.