You are correct.  You should love your grandson and his partner.  For the Christian, we know that “…the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us.” (Romans 5:5).  You not only have natural love for your grandson, but you have the very love of God poured out into your heart to love others…certainly including your gay grandson and his partner.

We read this about the Lord Jesus in John 1:14, “And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.”  Christ IS the Word and He was made flesh (He was born of Mary) and He lived in the world as a man, although He is also God.  He was full of GRACE and TRUTH! 

It is through the GRACE of God that we are led to believe on the Lord Jesus.  We read in Ephesians 2:8-9, “For by GRACE are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.”  It is TRUTH that allows us to know and follow the Lord.  1 Corinthians 13:6 tells us that, “(Love) rejoiceth not in iniquity, but rejoiceth in the TRUTH.”  Grace and truth are inseparable partners and should never be used apart from each other.  LOVE your grandson and faithfully give him God’s TRUTH. 

Your grandson needs to know the love of the Lord Jesus…that Jesus loves him and died so that he might be forgiven for his sins.  John 3:16-17 says, “For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that THE WORLD THROUGH HIM MIGHT BE SAVED.”  We read in 1 Timothy 2:4 that the Lord wants, “…all men to be saved, and to come unto the knowledge of the truth.”  Your grandson, and his partner, are living in sin.  (All unsaved people are living in sin.)  The Lord wants to save them from the penalty of their sins.

Can the Lord save them and free them from this life of homosexuality?  Certainly, He can!  We read in Jeremiah 32:27 where the Lord says, “Behold, I am the LORD, the God of all flesh: is there any thing too hard for me?”  I want to point your attention to 1 Corinthians 6:9-10 which says, “Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.”  Those who live in rejection and opposition to the Lord come in many types.  There are ten listed here and one of them is “effeminate.”  This comes from the Greek word ‘malakós.’  In another translation, this is translated as “those who make women of themselves.”  This refers to those men who like to live as a woman with another man…homosexuality.  This is an abomination to the Lord and these “shall not inherit the kingdom of God.

However, let’s keep reading and see what the Lord says in 1 Corinthians 6:11, “And such WERE some of you: but ye are WASHED, but ye are SANCTIFIED, but ye are JUSTIFIED in the name of the Lord Jesus, and by the Spirit of our God.”  The cleansing power of the blood of the Lord Jesus has the ability to cleanse us from all our sins and remove us from a sinful lifestyle.  Can a homosexual overcome the desire to live such a life?  Well, looking back at 1 Corinthians 6:9-10, we might ask: Can a thief stop stealing?  Can an adulterer stop his sexual sinning? Can a drunkard stop drinking?  Of course they can, through the power of the Lord Jesus Christ.  Homosexuals can also stop their lives of sin by putting their faith in the Lord Jesus and follow the truth of His Word…the Bible. 

I do greatly encourage you to continue to show God’s grace and love to your grandson and his partner.  The most important thing he can do is to put his faith in the Lord Jesus.  Constantly remind him of how he has sinned and needs a savior.  He needs THE savior.  He needs to accept the Lord Jesus Christ as his savior.  Then, lovingly instruct him according to the truths of the scriptures…part of that would be to leave the sinful life of homosexuality behind him.  Do not let him think that you support that lifestyle.  In love to him, share the truth with him.  It is no act of love to give approval to him of that which the Lord condemns.  Your grandson is blessed to have you in his life to love and seek to help him.  May the Lord bless your efforts and lead your grandson and his partner to faith in the Lord Jesus Christ.  “…him that cometh to me I will in no wise cast out.” (John 6:37).  (CC)  (579.4)