Title (ownership) of the property do not have any doubt, it is "self-acquired" of your deceased husband, which is succeeded by you with your 3 children in equal share getting 1/4th each.
However, being undevided it remained undemarcated / unspecified for which someone of you (youngest son) have stated to have filed a suit (probably for partition & possession) wherein preliminary decree is already passed, if I have understood the facts posted by you correctly.
What do you mean by your statement that, the plaintiff (youngest son) did not inform the Court about sale deed was executed in favour of your 4 children during pendency of suit ????
Which case is being referred by you wherein you have stated to have been passed on 18 January by Supreme Court ???
There are subsequent queries / infirmities in your statement which your lawyer knows better that what you have posted and attempted to convey is different, vague and confusing.
Accordingly it is advisable to consult your lawyer.