As a sibling visa petition beneficiary, your spouse and children may accompany you. There will be additional visa applications for them at the consulate. You may want to retain counsel to coordinate and represent you and your family accordingly.
Are you in the US? You can still qualify when the priority date becomes current on the petition.
This is not legal advice and a client attorney relationship is not created. For a free consultation call (718)234-5588.
If you qualified under 245(i), you keep your qualification. Whether your husband will derive your 245(i) benefits depends on several factors, chief among them being when you married. If he did not derive 245(i) benefits, he will not be permitted to get his residence in the US.
Because derivative 245(i) benefits are tricky, I would strongly urge you to consult with an experienced immigration attorney who can review all the facts and advise you and your husband appropriately.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. A consultation with an experienced attorney is always the best way to go.