The Istari probably could have wives and children. They were Maiar, and we know that Maiar can have spouss and cildren. Melian the Maia had Luthien and was married to Thingol. So it would seem that it would be possible for Sarman, Gandalf, Radagast, and the rest of them to have a family, though they probably didn't have the time.
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When Elendil fell, Isildur departed to take up the high kingship of his father, and committed the rule of the south in like manner to the son of his brother. He did not relinquish his royalty in Gondor, nor intend that the realm of Elendil should be divided forever.
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