He has gave many powerful promises concerning our children!
Here are 5,
Jer 32:38 And they shall be my people, and I will be their God:
Jer 32:39 And I will give them one heart, and one way, that they may fear me for ever, for the good of them, and of their children after them:
Jer 32:40 And I will make an everlasting covenant with them, that I will not turn away from them, to do them good; but I will put my fear in their hearts, that they shall not depart from me.
Of course the word "fear" in this sense, is not to be afraid, but, to reverence God. Proper respect to God for who He is!
He is a "family God".
The God of Abraham, Isaac, Jacob,who were father, son, grandson!
Yes your children have "freewill". Yet God knows how to bring them in.
The devil blinds, but God can open your childrens eyes.
Stand on the promises!
Isa 59:21 As for me, this is my covenant with them, saith the LORD; My spirit that is upon thee, and my words which I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of thy seed, nor out of the mouth of thy seed's seed, saith the LORD, from henceforth and for ever.
This is a good one for grandchildren too!
Act 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Act 2:39 For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
Isa 44:3 For I will pour water upon him that is thirsty, and floods upon the dry ground: I will pour my spirit upon thy seed, and my blessing upon thine offspring:
Isa 44:4 And they shall spring up as among the grass, as willows by the water courses.
Not only will he save them, He will bless them!!!
Psa 112:2 His seed shall be mighty upon earth: the generation of the upright shall be blessed.
There are many more here!