"My family (sister and brother and their families) lives in Cleveland, Ohio. For the last 17 years I have been praying for them, slowly sending them letters of belief, Bible truths. But still to this day they will not accept the Sabbath, nor the Bible truths from me, but they are strict Catholics and will accept the priest's statements."
First of all, just because they have not responded to your spiritual promptings IN A MANNER IN WHICH YOU FEEL THEY SHOULD does not mean they have not been touched and pricked in their hearts by the Holy Spirit. I am hard pressed to believe that anyone who is SINCERE ABOUT BEING SAVED is not affected in some manner when they encounter, or come in contact with, the Truths of the Bible. It might take time (sometimes more time than we are willing to allow) for the full impact of God's Word to make an impression upon the human heart, which brings me to my second point.
Secondly, where the Word of God and salvation are concerned, all we as humans can do is SOW THE SEEDS OF TRUTH. We cannot bring ANYONE to repentance by way of our words, or our tracts. ONLY THE HOLY SPIRIT CAN BRING MEN AND WOMEN TO REPENTANCE!! The Holy Spirit, who is God, sees the honesty and sincerity of those who are truly repentant and infills us with His Spirit empowering us with the Holy Ghost WHICH GIVES US THE POWER TO OBEY and live by every Word that proceeds out of the Mouth of God (John 16:7-14; Acts 1:8; Matt. 4:4).
So, keep on doing what you are doing, Until probation closes, all who are desirous still have a chance to accept Jesus Christ, the Word of God, and be saved.
"I am told that when they find the truth and do not accept it they will be lost. Will they be lost if they died even now, before they have to choose?..."
Again, "who" is saved and "who" is lost is determined by God AND HIM ALONE based upon a Standard of Judgment He has established. ONLY GOD KNOWS THE HUMAN HEART (1 Sam. 16:7). Therefore (please don't miss this), just because a person does not join the Seventh-day Adventist Church WHEN WE THINK HE OR SHE SHOULD JOIN does not mean that an individual has not accepted Jesus Christ and the Word of God:
"And other sheep I have, which are not of this fold: them must I also bring, and they shall hear my voice; and there shall be one fold, and one shepherd." John 10:16.
Notice Who does the bringing. It is God Himself!! WHEN that "bringing" occurs is not for us to know. God has His time and place when true conversion takes place in the life of an individual that is known only to Him. Many are in graves who have died, but ONLY GOD AND HIM ALONE knows their true spiritual condition in death. For those who are alive and remain, I very firmly believe that when both the truths this church has been teaching AND THE TIME OF TROUBLE BECOME A REALITY, many who are not now identified as Sabbathkeepers will come over on the side of Bible Truth. But for right now, all we can do is pray for those for whom we have labored.
M.A.