Please give your dear wife our SINCEREST condolences and wish for love and peace, dear Jochy (the greatest of love and peace to you and her, both, our dear brother!). I can't add anything to what's already been stated here, except this:
Perhaps, when your dear wife is feeling better she might consider sending copies of the following from the NWT Reference Bible (or the smaller version, if you don't have the large one) with the following words highlighted/underlined to her dear parents:
From
John 6:48-55 (Page 1290):

From
John 10:7-9 (Page 1296):

From
John 10:16 (Page 1297):

From
John 10:27, 28 (Page 1297):

No need to include anything else (although, you might wish to make better copies AND include something on them that says what verses they are) as these verses don't need
our words, dear one. Folks with either get them or they won't. Either way, it's up to JAH and Christ, not them OR us.
Matthew 13:10-17; John 6:44 WE don't choose who does or doesn't, even as to ourselves.
That's not to say they WON'T get it, not at all - they very well might. Nor it is to say that if they don't they won't be part of the kingdom but like Joseph's brothers who initially rejected him, even sought to kill him, JAH shows mercy to whomever HE chooses.
Matthew 25:31-40The point is that the WTBTS almost NEVER refers to these verses, if EVER, with the exception of parts of
John 10:16, which they misstated and misteach. It can be upon us, then, to help others learn what CHRIST says, versus what the "hired man" who purports to stand in his place and so is a thief and plunderer, says.
This, however, might help your dear in-laws understand WHY you dear ones chose to do what you did... and how they may well be passing by the very ever lasting life and resurrection... and ability to live forever... they are looking forward to.
May the undeserved kindness and mercy of our God and dear Father, the MOST HOLY One of Israel, JAH of Armies, and the love and peace of His Son and Christ, our dear Lord, Master, and King, JAHESHUA, the Chosen One of JAH (MischaJah) be upon you BOTH... and your entire household... to time indefinite!
YOUR servant, sister, and fellow slave of Christ,
Shellama