Your story doesn't surprise me. One particularly interesting trend in recent genetics is moving beyond univariate twin studies for examining social outcomes like education, income, or SES in general: GCTA means that we have heritability estimates which can no longer be seriously doubted, bivariate GCTA and twin study genetic correlations are showing that all of these outcomes are related on the genetic level, the large GWASes of education provide polygenic genetic scores which predict life outcomes and can be used in Mendelian randomization to figure out whether family income causes intelligence or vice versa (it's the latter), LD score regression is an even newer technique than GCTA which lets researchers do all of this with just publicly available data (it's tragic how many of the latest studies could've been done back in like 2012, except all the necessary data was siloed in places like 23andMe), and the UK Biobank is providing an enormous cohort which is genotyped and phenotyped along several dimensions and makes it possible to demonstrate how genetic intelligence causes lower BMI, better health, higher income, education, etc. Some interesting links:

- "Genome-Wide Estimates of Heritability for Social Demographic Outcomes" http://www.gwern.net/docs/genetics/2016-domingue.pdf
- "Polygenic Influence on Educational Attainment: New Evidence From the National Longitudinal Study of Adolescent to Adult Health" http://ero.sagepub.com/content/1/3/2332858415599972, Domingue et al 2015
- "Genetic influence on family socioeconomic status and children's intelligence" http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3907681/, Trzaskowski et al 2014
- "Genetic link between family socioeconomic status and children's educational achievement estimated from genome-wide SNPs" http://www.nature.com/mp/journal/v21/n3/full/mp20152a.html, Krapohl & Plomin 2016
- "Molecular genetic contributions to socioeconomic status and intelligence", Marioni et al 2014 http://www.sciencedirect.com/science/article/pii/S0160289614...
- "Molecular genetic contributions to social deprivation and household income in UK Biobank (_n_=112,151" http://biorxiv.org/content/early/2016/03/09/043000, Hill et al 2016 (correlation graph https://pbs.twimg.com/media/CdMobKRXEAEMkmi.jpg:large
- "Height, body mass index, and socioeconomic status: Mendelian randomisation study in UK Biobank" http://www.bmj.com/content/352/bmj.i582, Tyrrell et al 2016
- "The Genetics of Success: How Single-Nucleotide Polymorphisms Associated With Educational Attainment Relate to Life-Course Development" http://www.gwern.net/docs/genetics/2016-belsky.pdf, Belsky et al 2016
- "Poverty and Behavior: Are Environmental Measures Nature and Nurture?" http://emilkirkegaard.dk/en/wp-content/uploads/Poverty-and-B..., Rowe & Rodgers 1997
- "Signaling and Productivity in the Private Financial Returns to Schooling" http://paulbingley.com/papers/signals-manuscript.pdf, Bingley et al 2015 (highly unusual design
- "Do Jobs Run in Families?" https://research.facebook.com/blog/do-jobs-run-in-families-/
- "Intelligence: Is it the epidemiologists' elusive 'fundamental cause' of social class inequalities in health?" https://pingpong.ki.se/public/pp/public_courses/course07397/..., Gottfredson 2004