WHERE? Seriously. Equal in what respect? They could all be, for example, equal in that they are blessed but not the same in that they were blessed differently and/or to different degrees.
Anyway, it would be a help to see where Christ said that, I'm sure I'll slap my head when I see it, ("Duh" moments are good for my humility) but I don't think of "equality" as a biblical "value", off hand. (That's from my Anglican, C.S. Lewis days, not something I picked up with myu Papist deviations.)
Equal as fellow believers with God, through Christ.
Mary has no more a special relationship with Christ's his earthly mother than any other believer who does His will on earth.
She was a sinner saved by grace like all of us and was chosen for a special task that she completed while on earth.
Nothing more and nothing less.
And that was the point that Christ was making when He emphasized His words and not Mary as His mother.