I have difficulty in understanding the last part of the following quotation.
(An old lord threatens his grandson saying that he might not leave the property to him, and that he (the grandson) is not a proper successor to the title. In fact the lord was secretly married to a woman when young, and had a son between them. Since they did not divorce formally, the lord's son in the second marriage and the grandson are not legal successors. Hearing the quarrel of the lord and his grandson, the wife of the lord says to the latter:)
I am not afraid of your grandfather's intentions. He
has a regard for the name, and he means to leave all to you, who have
every right, unless, indeed, it may be, a legal right.
I think the last part means "you have every right to inherit the property though it may not be a legal right", but am not quite sure if my interpretation is correct. I don't understand particularly why the phrase "it may be" is inserted. I appreciate any comments. Thank you.