What is the ruling on concealing testimony in order to please one's family, when there are other witnesses?

The questioner : Peace be upon you. If you please, a person was asked to give testimony, but he conceals this testimony in order to please his family. What is the ruling in that?

The Shaykh : It is not permissible.

The questioner : With the existence of an alternative for him.

The Shaykh : What is the alternative?

The questioner : I mean, the existence of other witnesses.

The Shaykh : And the judge, when he asks, does he ask for one witness or witnesses?

The questioner : I mean, those who asked for it are the people involved in the incident.

The Shaykh : I did not ask you about that, may Allah bless you. Did the judge ask for one witness or witnesses?

The questioner : It is before the judgment.

The Shaykh : My brother, answer the question, may Allah guide you. Did the judge ask for one witness or witnesses?

The questioner : Witnesses.

The Shaykh : Okay, the witnesses responded.

The questioner : Some of them responded, and some of them did not respond.

The Shaykh : So it is not permissible for him not to respond.
The student : Good, if Allah wills. May Allah reward you with good.

The Shaykh : Yes, and may Allah protect you.
The student : ... .

The Shaykh : I am sorry, there was no "Peace be upon you."