Supreme Court has held that a related witness would ordinarily speak the truth, but in the case of an enmity there may be a tendency to drag in an innocent person as an accused—each case has to be considered on its own facts.

From Paras 25 and 26,

“25. We are unable to agree with the learned Judges of the High Court that the testimony of the two eyewitnesses requires corroboration. If the foundation for such an observation is based on the fact that the witnesses are women and that the fate of seven men hangs on their testimony, we know of no such rule. If it is grounded on the reason that they are closely related to the deceased we are unable to concur. This is a fallacy common to many criminal cases and one which another Bench of this Court endeavoured to dispel in Rameshwar v. State of Rajasthan.”
In the said case, it has also been further observed: (AIR p. 366, para 26)
“26. A witness is normally to be considered independent unless he or she springs from sources which are likely to be tainted and that usually means unless the witness has cause, such as enmity against the accused, to wish to implicate him falsely. Ordinarily a close relative would be the last to screen the real culprit and falsely implicate an innocent person. It is true, when feelings run high and there is personal cause for enmity, that there is a tendency to drag in an innocent person against whom a witness has a grudge along with the guilty, but foundation must be laid for such a criticism
and the mere fact of relationship far from being a foundation is often a sure guarantee of
truth.”

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