Author. Researcher. The adopted kid who grew up inside a functioning grandmother network — and spent years trying to understand why it worked.
Martin Vendemia was adopted as an infant into a large, close-knit family that never treated him as anything other than their own. He grew up inside a functioning grandmother network — not because he was born into it, but because the conditions were met: proximity, duration, an elder at the center, unconditional inclusion.
His adoption is, in a sense, the strongest evidence this book has to offer. The function worked for him because the conditions were right. Not the biology. The conditions. Everything the Grand Matriarchy series argues follows from that fact.
This is also why he can write this argument without nostalgia. He isn't describing something he lost. He's describing something he was given by people who chose to give it — people who understood, without necessarily using the word, that the grandmother function is not inherited. It is built. It is chosen. It can be performed by anyone willing to hold the center.
That understanding, arrived at personally before it was confirmed by decades of research, is the origin of this project.
The function worked for him because the conditions were right. Not the biology. The conditions.
The Grand Matriarchy series draws on evolutionary biology, anthropology, sociology, developmental psychology, and the comparative study of family structures across cultures. The core evidence: the human grandmother's long post-reproductive lifespan is an adaptation, not an accident. The grandmother function was so valuable to the survival of the species that evolution selected for it.
The 2019 global systematic review in Social Science and Medicine — 12,000+ abstracts screened, 206 studies analyzed — confirmed what the evolutionary evidence had long suggested: grandparent involvement produces measurable improvements in child wellbeing, adult resilience, and family stability.
This isn't sentiment. It's biology. And it is the foundation of every argument in the series.
This is a structural argument, not a moral one. It doesn't blame anyone for the changes in family life over the past fifty years. It doesn't ask anyone to go backward. Geographic mobility scattered kin networks. Changing labor markets pulled grandmothers into full-time work. Cultural individualism shifted the default from connection to independence. No single force was the cause. No individual was at fault.
What this argument does is name the function that was lost, show the evidence for what that costs, and make the case — with precision and without nostalgia — that what was dismantled by accident can be rebuilt by design.
Not a call for women to return to the home. The grandmother function and women's freedom to work and lead are separable. They became entangled through specific historical circumstances. They don't have to stay entangled.
Not a claim that feminism caused the decline of kin support networks. Economic restructuring, geographic mobility, housing markets, cultural individualism — all played roles. Unintended consequences aren't the same as blame.
Not nostalgia for a past that was better. The past that contained the Grand Matriarchy also contained patriarchal control and limited opportunity. Recovering the functional elements doesn't require recovering any of that.
Not a claim that every grandmother is good. Some kin networks are toxic. The function can be performed badly. Context always matters.
Inner Group Media is an independent publisher based in Maryland, not far from Washington D.C. It was built to carry work at the intersection of family research, community design, and structural thinking — work that asks why things are the way they are, and whether they can be built differently.
The Grand Matriarchy series is Inner Group Media's founding project. Five books. One argument. A complete picture of what was lost, what it costs, and how to rebuild it.
Contact: info@innergroupinc.com
The argument begins in The Grand Matriarchy and runs across all five books. Start anywhere. Start here.