taharat

dear brother once i utinate in the toilet in night and some urine fell on floor which i didnt wash since i found out that najis can be transfer i have washed the area and around. The problem is i urinated in toilet and every body in my family use toilet barefoot so there i every chance of najis be transfer to other part of house. Also the towel which been used to wipe the body became najis . We use five or six towel so i dont know which became najis. Please help on this matter
I didnt knew that najis can be transfer