The extent to which people's social status is associated with their parents' status has far-reaching implications for the openness of and stratification in society. Whereas most research focused on the father-child association in advanced economies, less is known about the role mothers play in intergenerational mobility, particularly in a global context. We assembled a dataset of 1.79 million individuals born in 1956-1990 across 106 societies to examine the global patterns of intergenerational educational mobility and how they vary with education expansion and changes in parents' educational pairing. With education expansion, father-child associations in educational status become weaker and mother-child associations become stronger. With the prevalence of hypogamous parents (mother more educated), mother-child associations are stronger, but father-child associations are weaker. With the prevalence of hypergamous parents (father more educated), mother-daughter associations are weaker. Our global evidence calls for a gender-sensitive understanding of how education expansion matters for intergenerational mobility.