I'm really confused of the terms

kinship coefficient coefficient of relationship relatedness inbreeding coefficient

As I understood, inbreeding coefficient shows how much an individual's parents are inbred, and means the probability of an individual receiving same alleles from the co ancestor of it's parents. For example, let's say an individual X has I, J as parents and I,J have a co ancestor K. if K had genotype AB, the inbreeding coefficient of X would be the probability of X receiving AA or BB from K

I'm not sure about the rest. some say as if kinship coefficient, coefficient of relationship and relatedness is the same and some treat it differently. I'm so confused can anyone help me please?